68485809420 has 720 divisors, whose sum is σ = 258435555840. Its totient is φ = 15131660544.

The previous prime is 68485809409. The next prime is 68485809433. The reversal of 68485809420 is 2490858486.

68485809420 is a `hidden beast` number, since 68 + 4 + 85 + 80 + 9 + 420 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 420158259 + ... + 420158421.

It is an arithmetic number, because the mean of its divisors is an integer number (358938272).

Almost surely, 2^68485809420 is an apocalyptic number.

68485809420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68485809420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129217777920).

68485809420 is an abundant number, since it is smaller than the sum of its proper divisors (189949746420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68485809420 is a wasteful number, since it uses less digits than its factorization.

68485809420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344 (or 326 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 54.

The spelling of 68485809420 in words is "sixty-eight billion, four hundred eighty-five million, eight hundred nine thousand, four hundred twenty".